Filling Knowledge Base Gaps for Distant Supervision of Relation Extraction Wei Xu author Raphael Hoffmann author Le Zhao author Ralph Grishman author 2013-08 text Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics (Volume 2: Short Papers) Hinrich Schuetze editor Pascale Fung editor Massimo Poesio editor Association for Computational Linguistics Sofia, Bulgaria conference publication xu-etal-2013-filling https://aclanthology.org/P13-2117/ 2013-08 665 670